extends TileMapLayer

@onready var camera: Camera2D = $"../main_game_camera"

@export var render_radius: int = 20 # How many tiles out from the center to draw

# Keep track of which grid coordinates we've already loaded
var loaded_tiles: Dictionary = {}

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	pass # Replace with function body.



# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	if camera:
		generate_tiles_around_camera()

func generate_tiles_around_camera() -> void:
	# 1. Convert the camera's pixel position into grid coordinates
	var camera_grid_pos = self.local_to_map(camera.global_position)
	
	# 2. Loop through a square grid area around the camera
	for x in range(camera_grid_pos.x - render_radius / camera.zoom[0], camera_grid_pos.x + render_radius / camera.zoom[0]):
		for y in range(camera_grid_pos.y - render_radius / camera.zoom[1], camera_grid_pos.y + render_radius / camera.zoom[1]):
			var tile_coords = Vector2i(x, y)
			
			# 3. Only place a tile if we haven't already placed one there
			if not loaded_tiles.has(tile_coords):
				# set_cell(coords, source_id, atlas_coords)
				# Assumes your source_id is 0 and your square tile is at (0,0) in the atlas
				self.set_cell(tile_coords, 0, Vector2i(0, 0))
				loaded_tiles[tile_coords] = true